Abstract

An account is given of the karyotypes of 29 species of medium sized Dytiscidae (Coleoptera). Of the 20 species of Agabus Leach, 1817, 18 have karyotypes comprising 21 pairs of autosomes and sex chromosomes which are either X0(♂) or XX (♀). These species are A. serricornis (Paykull, 1799), A. labiatus (Brahm, 1791), A. congener (Thunberg, 1794), A. lapponicus (Thomson, 1867), A. thomsoni (J. Sahlberg, 1871), A. confinis (Gyllenhal, 1808), A. sturmii (Gyllenhal, 1808), A. bipustulatus (Linnaeus, 1767), A. nevadensis Håkan Lindberg, 1939, A. wollastoni Sharp, 1882, A. melanarius Aubé, 1837, A. biguttatus (Olivier, 1795), A. binotatus Aubé, 1837, A. affinis (Paykull, 1798), A. unguicularis (Thomson, 1867), A. ramblae Millan & Ribera, 2001, A. conspersus (Marsham, 1802) and A. nebulosus (Forster, 1771). However two species, A. infuscatus Aubé, 1838 and A. adpressus Aubé, 1837, have developed a neo-XY system, with karyotypes comprising 21 pairs of autosomes and XY sex chromosomes (♂). No chromosomal differences have been detected between typical A. bipustulatus and A. bipustulatus var. solieri Aubé, 1837, nor have any been found between the three species of the A. bipustulatus complex (A. bipustulatus, A. nevadensis and A. wollastoni). The four species of Colymbetes Clairville, 1806, C. fuscus (Linnaeus, 1758), C. paykulli Erichson, 1837, C. piceus Klug, 1834 and C. striatus (Linnaeus, 1758) have karyotypes comprising 20 pairs of autosomes and sex chromosomes which are X0 (♂), XX (♀). Two of the species of Rhantus Dejean, 1833, R. exsoletus (Forster, 1771) and R. suturellus (Harris, 1828) have karyotypes comprising 20 pairs of autosomes and X0/XX sex chromosomes, but the other three species, R. grapii (Gyllenhal, 1808), R. frontalis (Marsham, 1802) and R. suturalis (Macleay, 1825) have 22 pairs of autosomes and X0/XX sex chromosomes. Agabus congener and Rhantus suturellus may have one B-chromosome. Nine of the species have previously published karyotype data but for seven of these the data are wrong and are here corrected.

Addeddate

2025-03-16 15:53:36

Bhl_virtual_titleid

210879

Bhl_virtual_volume

v.7:no.2 (2013)

Call number

10_3897_compcytogen_v7i2_5223

Call-number

10_3897_compcytogen_v7i2_5223

Foldoutcount

0

Genre

article

Identifier

karyotypessomem7angu

Identifier-ark

ark:/13960/s2c58rjs7g0

Identifier-bib

10_3897_compcytogen_v7i2_5223

Identifier-doi

10.3897/compcytogen.v7i2.5223

Issue

2

Ocr

tesseract 5.3.0-6-g76ae

Ocr_detected_lang

en

Ocr_detected_lang_conf

1.0000

Ocr_detected_script

Latin

Ocr_detected_script_conf

1.0000

Ocr_module_version

0.0.21

Ocr_parameters

-l eng

Page_number_confidence

75

Page_number_module_version

1.0.5

Page_range

171-190

Pages

20

Pdf_degraded

invalid-jp2-headers

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0.0.25

Possible copyright status

In copyright. Digitized with the permission of the rights holder.

Ppi

300

Source

Comparative Cytogenetics 7(2)

Year

2013

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